Door-spring.



Pate'nfed Nov. 2|, I899.

M. C. 'BERSTED.

D 00 R S P R l N G (Application filed Apr. 19, 1899.)

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UNITED STATES PATENT ormn.

MARTIN C. BERSTED, OF CHICAGO, ILLINOIS.

DOOR-SPRING;

SPECIFICATION forming part of Letters Patent No. 637,319, dated November21, 189s. Application filed April 19, 1899. Serial No. 713,547. (Nomodel.)

To all whom it may concern:

Be it known that I, MARTIN O. BERSTED, a citizen of the United States,residing at Chicago, in the county of Cook and State of Illinois, haveinvented certain new and useful Improvements in Door-Springs, of whichthe following is a full, clear, and exact specification.

My invention relates more particularly to that class of door-springsconsisting of a torsion-spring-such, for example, as acoilspring-attached at one end to the door and at the other end to thedoor-frame or some other fixed part; and my invention has for itsprimary object to simplify, cheapen, and improve the construction of thedevices for thus attaching the spring.

Another object of my invention is to provide an improved and efficientform and arrangement of holding-dog and coacting parts for preventingthe unwinding of the spring and at the same time permitting the tensionof the spring to be easily and conveniently altered at will.

WVith these ends in View my invention consists in certain features ofnovelty in the construction, combination, and arrangement of parts bywhich the said objects and certain other objects hereinafter appearingare attained, all as fully described with reference to the accompanyingdrawings and more particularly pointed out in the claims.

In the said drawings, Figure'l is a side elevation of a part of the doorand the frame with my improved spring attached thereto. Fig. 2 is avertical longitudinal sectional view of the spring detached, taken onthe line 2 2, Fig. 1. Fig. 3 is a face View of the blank of which thefixed bracket for holding one end of the spring is composed. Fig. 4 is aface View of the blank of which the bracket at the other end of thespring for holding the revolving hub hereinafter described is composed.Fig. 5 is a similar View of the blank for composing the aforesaidrevolving hub. Fig. 5 is a view showing the next stepin the formation ofthe hub. Fig. 6 is a transverse sectional view taken on the line 6 6,Fig. 2, on an enlarged scale. Fig. 7 is a face View of the revolving huband its holding-bracket, showing a modified form, the part of theholding-bracket which embraces the hub being shown in section; and Fig.8 is a sectional View thereof, taken on the line 8 8, Fig. 7.

1 represents the door, and 2 the frame; but so far as the operation ofthe spring is concerned' 1 might be the frame and 2 the door; and 3 is acoil-spring of the usual or any suitable form commonly employed for thisclass of door-springs. In the upper end of the coilspring 3 is inserteda stem 4, which is formed on a bracket attached by screws 5 to theportion 2, the stem 4 having an aperture for the admission of the end 6of the spring 3 for preventing the spring from rotating as the door isopened. This stem 4: and bracket are oomposed of a blank. (Shown in Fig.3.) This blank consists of a plate 7, which has a central substantiallycircular portion from which radiate a number of tongues 8, three beingshown, and also an ear 9, having perforations 10 for the admission ofscrews 5. The stem 4 is formed by striking up the plate '7, preferablyon the circular dotted line 11, and bringing the tongues 8 together edgeto edge, a space between the inner ends of the tongues adjacent to theear 9 being left for the admission of the inturned end 6 of the spring.The ear 9 isgiven its proper relative position .or arrangement withrespect to the stem 4 by bending it off at substantially right angles tothe face of the plate 7, as shown in Fig. 2, the edges of the ear 9, ifdesired, being serrated and turned downwardly to form teeth 12 forengaging in the woodwork and better holding the bracket in place. In theother end of the spring 3 is inserted a stem 13, having one or moreholes 14, into which the inturned end 15 of the spring may be insertedfor causing the spring to twist. The stem 13 is formed on a revolvinghub, with which the locking mechanism and the tightening-key engage, aswill be understood. This hub is shown at 16 in Figs. 1 and 2, and it iscomposed of the blank shown in Fig. 5. This blank consists of a plate17, which is substantially circular and has radiating from it a numberof tongues 18, four of the same being shown projecting from the plate,on the diameters thereof, and each of the tongues is'provided near itsinner end on each side with a prodotted line 20, which therebyconstitutes a cup-shaped form, and the perforations 14 in the side ofthe hub 16 are formed by squeezing the tongues 18 together until theprojections or bosses 19 meet, as shown in Fig. 5. If after this coursethe tongues 18 are squeezed still further together until they meetthroughout substantially their entire lengths, it will be seen that thestem 13 will be constituted, and the perforations 14 will also be leftbetween the tongues at their inner ends, just above the perforations 14.In striking up the blank to form this hub and stem the body portion 16of the hub is compressed at a point slightly above its lower end or edgeto form a flange 21, over which engages an inturned flange 22 on theholding-bracket for the hub, which I will now describe. This bracket,which is secured to the door or part 1 by screws or other devices 23, iscomposed of the blank shown in Fig. 4. This consists of a plate having acircular portion 24 and a projecting ear 25, provided with perforations26 for the passage of the screws 23. The car 25 is bent at anangle-substantially right angles-to the face of the plate 24, and theedges of the plate 24 are serrated, so that after its edges are turnedup to form a cup for receiving the hub 16 the serrated edge may beturned or reamed over the flange 21 for preventing the hub from beingwithdrawn from the cup or socket 27 thus formed. The edges of the car 25may be serrated, as shown in Fig. 4, and turned downwardly to engage inthe woodwork.

The plate 17 is provided with a central aperture 28, having a number ofteeth or notches 20 formed in its edge, and passing through a slot 30 inthe plate 24 is a locking dog or pin 31, which engages with one of theteeth or notches 29, and thus holds the hub 16 against rotation, theteeth or notches being beveled o'r inclined to permit the hub to turn inthe opposite direction when sufficient power is applied by means of akey (not shown) inserted in one of the perforations 14 when it isdesired to alter the tension of the spring. The locking-dog 31 isprovided on its outer end with a thumb-piece or head 32, whereby it maybe slipped back and forth in the slot 30 to engage or disengage theteeth 29, and the innerend of the dog 31 is provided with a flange 33,which prevents the dog from falling out of the slot 30. In order thatthe dog may be inserted through the slot 30, the plate 24 at one end ofthe slot is provided with a tongue 34, struck up therefrom and being ofsuflicient diameter to admit the flange 33. After the flange has beeninserted the tongue 34 is pressed down into place to fill up the openingthrough which the flange entered.

In the form of my invention shown in Figs. 7 and 8 the locking-dogs 31,which is the same in construction as the dog already described withreference to the other form, is arranged in the side of the bracket andengages the teeth in the side of the hub instead of in the end. In thisform 35 represents the stem corresponding to the stem 13, 36 representsthe hub corresponding to the hub 16, and 37 is the plate upon which thehub-socket is formed. 38 represents the teeth, which are formed in aflange 39 on the side of the hub 36 and with which the dog 31 engages.Just above the teeth 38 the hub is formed with a peripheral flange 40,which, together with the flange 39, constitutes aperipheral channel forthe end of the dog or pin 31 to run in. The pin or dog is held in placeby being passed through a slot 41 in the side of the hub socket or cup2", and it is prevented from pulling out of the slot by its head 33,which engages over the teeth and flange 39.

Having thus described my invention, what I claim as new therein, anddesire to secure by Letters Patent, is-

1. The combination with a coil-spring and means for securing it at oneend, of a plate having radiallyprojecting tongues bent toward oneanother, edge to edge, to form a stem entering and being secured totheother end of said spring, and means for attaching said plate to thepart to which it is to be secured, substantially as set forth.

2. The combination with a coil-spring and means for securing it at oneend, of a plate having radially-projecting tongues and an ear, said earbeing bent at an angle to the face of the plate and the tongues beingbent together edge to edge to form a stem inserted in and being securedto the other end of said spring, and means for attaching said ear,substantially as set forth.

3. The combination with a coil-spring having means for securing it atone end, of a revolving hub having a stem entering the other end of saidspring and being secured thereto and provided with a series of teeth, aholding bracket or socket for said hub having a slot and a locking pinor dog passing through said slot and engaging said teeth, substantiallyas set forth.

4. The combination with a coil-spring and means for attaching it at oneend, of a revolving hub having a stem entering and being secured to theother end of said spring, said hub having a series of teeth, a holdingbracket or socket for said hub having a slot, a flanged pin or dogpassing through said slot, a tongue equal in diameter to the flange ofsaid pin, struck out of said bracket eontiguous to said slot foradmitting said flange and being bent down flush with the bracket forholding said pin from withdrawal, substantially as set forth.

5. The combination with a coil-spring and means for attaching it at oneend, of a hub composed of a plate having an aperture provided with anotched edge, said plate having radial tongues bent together to form astem entering the other end of said spring and having means ofattachment to said spring, a holding-socket for said hub and alockingdog secured to said socket and engaging the notched edge of saidaperture, substantially as set forth.

6. The combination with a coil-spring and means for attaching it at oneend, of a hub composed of a plate having an aperture provided withnotched edges and radial tongues projecting from said plate and havingbosses near the inner ends thereof, said tongues being squeezed togetherto bring said bosses into contact to form apertures, and a stem forinsertion into said spring, a bracket having a cup-shaped socket havingits edges reamed over a part of said hub and a locking dog or pinpassing through said bracket and engaging the notched edge of saidaperture, sub stantially as set forth.

7. The combination with a coil-spring and means for attaching it at oneend, of a hub having a stem and aseries of apertures for receiving theother end of said spring and a tightening-key respectively, said hubbeing composed of a plate having its edge struck up to form the side ofthe hub and tongues radiating from the body of the plate and hav-

